content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.]
   *
   * --------------
   * DateRange.java
   * --------------
   * (C) Copyright 2002-2008, by Object Refinery Limited and Contributors.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   Bill Kelemen;
   *
   * Changes
   * -------
   * 22-Apr-2002 : Version 1 based on code by Bill Kelemen (DG);
   * 07-Oct-2002 : Fixed errors reported by Checkstyle (DG);
   * 23-Sep-2003 : Minor Javadoc update (DG);
   * 28-May-2008 : Fixed problem with immutability (DG);
   * 01-Sep-2008 : Added getLowerMillis() and getUpperMillis() (DG);
   *
   */
  
  package org.jfree.data.time;
  
  import java.io.Serializable;
  import java.text.DateFormat;
  import java.util.Date;
  
  import org.jfree.data.Range;
  
  /**
   * A range specified in terms of two <code>java.util.Date</code> objects.
   * Instances of this class are immutable.
   */
  public class DateRange extends Range implements Serializable {
  
      /** For serialization. */
      private static final long serialVersionUID = -4705682568375418157L;
  
      /** The lower bound for the range. */
      private long lowerDate;
  
      /** The upper bound for the range. */
      private long upperDate;
  
      /**
       * Default constructor.
       */
      public DateRange() {
          this(new Date(0), new Date(1));
      }
  
      /**
       * Constructs a new range.
       *
       * @param lower  the lower bound (<code>null</code> not permitted).
       * @param upper  the upper bound (<code>null</code> not permitted).
       */
      public DateRange(Date lower, Date upper) {
          super(lower.getTime(), upper.getTime());
          this.lowerDate = lower.getTime();
          this.upperDate = upper.getTime();
      }
  
      /**
       * Constructs a new range using two values that will be interpreted as
       * "milliseconds since midnight GMT, 1-Jan-1970".
       *
       * @param lower  the lower (oldest) date.
       * @param upper  the upper (most recent) date.
       */
      public DateRange(double lower, double upper) {
          super(lower, upper);
          this.lowerDate = (long) lower;
          this.upperDate = (long) upper;
      }
  
      /**
       * Constructs a new range that is based on another {@link Range}.  The
       * other range does not have to be a {@link DateRange}.  If it is not, the
       * upper and lower bounds are evaluated as milliseconds since midnight
       * GMT, 1-Jan-1970.
       *
       * @param other  the other range (<code>null</code> not permitted).
       */
      public DateRange(Range other) {
          this(other.getLowerBound(), other.getUpperBound());
      }
  
      /**
       * Returns the lower (earlier) date for the range.
       *
       * @return The lower date for the range.
       *
       * @see #getLowerMillis()
       */
      public Date getLowerDate() {
          return new Date(this.lowerDate);
      }
  
      /**
       * Returns the lower bound of the range in milliseconds.
       *
       * @return The lower bound.
       *
       * @see #getLowerDate()
       *
       * @since 1.0.11
       */
      public long getLowerMillis() {
          return this.lowerDate;
      }
  
      /**
       * Returns the upper (later) date for the range.
       *
       * @return The upper date for the range.
       *
       * @see #getUpperMillis()
       */
      public Date getUpperDate() {
          return new Date(this.upperDate);
      }
  
      /**
       * Returns the upper bound of the range in milliseconds.
       *
       * @return The upper bound.
       *
       * @see #getUpperDate()
       *
       * @since 1.0.11
       */
      public long getUpperMillis() {
          return this.upperDate;
      }
  
      /**
       * Returns a string representing the date range (useful for debugging).
       *
       * @return A string representing the date range.
       */
      @Override
      public String toString() {
          DateFormat df = DateFormat.getDateTimeInstance();
          return "[" + df.format(getLowerDate()) + " --> "
                  + df.format(getUpperDate()) + "]";
      }
  
  }
  